/Engine/Source/Developer/MeshMergeUtilities/Public/MeshMergeDataTracker.h
Tries to retrieve aFMeshDescriptionfor the given mesh and LOD index, if it can't it will try to find an entry for each LOD levle below InOutDesiredLODIndex
[FMeshDescription](API\Runtime\MeshDescription\FMeshDescription) * TryFindRawMeshForLOD ( int32 MeshIndex, int32 & InOutDesiredLODIndex )